These are the ones that I purchased in the past: https://www.amazon.com/gp/product/B013NKCBX2/ref=oh_aui_detailpage_o08_s02?ie=UTF8&psc=1

They are single compartment, but also come with small cups for sauces/dressings. I would agree they are not leak-proof as well, but I have not had an issue yet. I think the portion size works quite well. If you are looking for some containers without a divider I would try these.